Hydraulic accumulator



O. WIRZ HYDRAULIC AGGKUMULATQRL Filed Apr-11 26, 191241 2 Sheati-Shee'c 1 .Zeven 502'@ Patented dan. i3, i925@ OTTO WIRZ, 0F CANNSTATT, GERMANY,

irse stares ASSIGNR TO THE FIR-M: CANNSTATTER MISCH- UND KNETMASCHINENFABRIK CANNSTATTER DAMPFBACKOFENFABRIK, WERNER 8c PFLEIDERER, OF CANNSTATT, GERMANY. V f

HYDRAULIC ACGUMULATOR'.

, Application filed April 26, 1924. Seria No. 709,299.

To all 'whom t may concern:

Be it known fthat I, OTTO IVIRZ, a citizen of Switzerland, residing at Cannstatt, Germany, have invented certain new and useful Improvements in Hydraulic Accumulators, of which the following is a specification. Y

My invention `refers to hydraulic accumulators and more particularly to devices of the sort in which a piston is arranged for free reciprocation within a cylinder, means being provided for supplying water under pressure below the piston, while V,the cylinder space above the piston is illed with air. In accumulators of this type, the piston has been connected with-a rod extending through thebottom of the cylinder by means of a non-rigid connection, such as a number of telescoping sleeves, this rod serving for actuating the means for regulating the supply of water to the cylinder. e

It is an object of my invention to improve more particularly the operative connection between this rod and the liquid supply regulating means with a view to providing a particularly simple andefective means of exactly adjusting the liquid supply.

In the drawings aiiixed to this specification and forming part thereof, two modifications of a device embodying my invention are illustrated diagrammatically by way of example. In the drawings Figs. l and 2 illustrate the irst modification, f 'q Fig. l being Van axial section of the hydraulic cylinder, the other parts being shown in elevation, while Fig. 2 is an elevation, partly in section, of the lower end of the rodandrthe parts connected therewith. y y

Figs. 3 and l illustrate a second modification, y q

Fig. 3 being a view similar to the lower portion of Fig. l, while Fig. 4L is a plan view of the parts shown in the lower half of Fig. 3. A

Referring first to Figs. l and 2, a is the liquid and `Z? is Vtheair space adjoining the two faces'of the piston c which is arranged for free reciprocation within the accumu` lator cylinder CZ. c, e are a number of telescoplngly connected sleeves, the uppermost of which is iixed to piston c and which are provided with flanges f preventing the upper end by a cap o leaving a passage for the rod g and at its lower end by a bottom n. The slide m is freely suspended in ring p and in its lowermos't position rests on the ring with the lower edge of the cap 0. On the slide m there is adjustably mounted a catch r.

` A forked bell crank lever s embraces slide m, its upwardly directed arm has a hook-shaped catch t cooperating with a cross beam u inserted in the fork of the weighted lever Z4, so as tolock this latter in one of its end positions, where the pump (not shown) which forces liquid into the cylinder d is operating.

On the pivot pin c of lever 7c a cam 'w is mounted whichcooperates with a lever y turning about pointI and connected with the rod .a of the distributing valve (not shown) which, when rod a is in its uppermost position, connects the suction chamber and the pressure chamber of the pump, while in the opposite position `of rod .a the valve separates these chambers.

According as catch r is adjusted in higher or lower position on slide m, the pump is thrown out sooner or later and consequently the stroke of piston c is increased or decreased, the pressure available in the accumulator being varied accordingly.

In the operation of the device, the accumulator is charged by the pump forcing water into the space below the piston c which 1s thereby caused to rise, the telescoping sleeves el, e bemg drawn asunder until the flange f of the lowermost sleeve carries the head 7c of rod g along. The feet 'i of this rod will move upwards in the tubular slide -m until it meets the cap 0,

whereupon slide m will rise in ring p together with rod g until catch 1 meets the forked ends of bell crank lever s which is thereby caused to rock about its pivot. The hook t being disengaged from'cross-beam u of lever It', this latter is now caused by its counter weight to assume the position shown in dotted lines. At the same time, cam tu lifts lever y which actstowards opening the distributing valve, whereby the pump is caused to run idle. Upon liquid under pressure being allowed to escape from cylinder fl, piston o will descend and rod g will move in downwai'd direction, until it reaches the position shown in Fig. l.

Near the lower end of its stroke, the foot- L' meets the bottom n of slide m, carrying this latter along with it until cap o meets ring p, whereby lever Iv is moved back into the position shown in full lines. At the same time, ring p, pressing the forked end of bell crank lever s downwards, causes hook t to enga-ge cross-beam u', thereby locking lever 7s in its end position. At the same. time, cam w moves back into its initial position, whereby lever y is enabled to lift rod s, thereby closing the valve and allowing the pump to force fresh liquid into the accumulator.

In the modification illustrated in Figs. 3 and 4, the slide m is mounted foi-'vertical reciprocation in a suitable guide 1 and carries a rack 2 meshing with a gear 3 mounted on an axle n. The hub 4 of gear wheel 3 A forms one half of a clutch, the other half of which forms part of the hub 5 of weighted lever le', which is mounted on axle w for free rotation, being secured, however against axial motion. A cam, eccenter or the like w mounted on'aXle o acts on lever g/ and rod e ofthe valve.

According as one or the other tooth of gear wheel 3 and rack 2 are in gear with one another, and in accordance with the diameter of gear wheel 3 and the width of the tooth gaps of clutch 5, the rocking motion of lever will take place in shorter or longer periods and in accordance therewith the stroke of the piston in the cylinder d and the pressure in the accumulator will vary. On the acumulator being charged with liquid, the foot of rod g will carry slide m upwards, together with rack 2. Gear wheel 3 being turned thereby, causes lever 7c to be rocked into the opposite position. In this movement, the lever la', being coupled with shaft o by aid of clutch 4, 5, causes cam w to lift lever y and to thereby change the operative position of the valve. On pressure liquid being tapped from cylinder b, rod g will act on sleeve m, thereby depressing rack 2, whereby gear wheel 3, axle fv and lever 7c are'turned in opposite direction, whereby cam to is withdrawn from underneath lever y, whereby the valve is closed and the pump is started.

I wish it to be understood that I do notV desire to be limited to the exact details of construction shown and described, for obvi ous modifications will occur to a person skilled in the art.

I claim l. Hydraulic accumulator comprising a closed cylinder, a piston freely reciprocable in said cylinder, a piston rod movably extending through the bottom of said cylinder, a non-rigid 'connection` between saidv piston and said piston rod, a slide movable on the free part of said rod, means for limiting the range of movement ofsaid slide relatively tending through the bottom of said cylinder,v

a non-rigid connection between said piston and saidV piston rod, a slide movable on the free part of said rod, means for limiting the range of movement of said slide relatively to said rod, a ydistributing valve adapted to govern the supply of liquid to said cylinder, a lever adapted torcontrol the operative position of said valve7 means for locking said lever and adjustable 'meansV connected with said slide and arranged for changing the operative position of said locking means and of said lever.

3. Hydraulic accumulator comprising a closed cylinder, a piston freely reciprocable in said cylinder, a piston rod movably extending through the bottom of said cylinder, a non-'rigid connection between said piston and said piston roth-a slide movable on the free part of said rod, means for limiting the range of movement of said slide relatively to said rod, Va distributing vvalve adapted to govern ythe supply of liquid to said cylinder, a weighted lever adapted to suddenly reverse the operative position of said valve and adjustable means connected with said slide and arranged to act on Vsaid lever.

4. Hydraulic accumulator comprising a closed cylinder, a piston freely reciprocable in said cylinder, a piston rod movably 9X-, tending through the bottomof said cylinder, a non-rigid connection between said piston and said piston rod, a slide movable on the free part of said rod, means for limiting the range of movement of said slide relatively to said rod, a distributing valve adapted to govern the supply of liquid to said cylinder, a Weighted lever adapted to suddenly reverse the operative position of said valve, a double-armed lever connected With said Valve, a @am connected with said Weighted lever arranged to act on the free end of said double-armed lever and adjustable means Connected with said slide and arranged to act on said Weighted lever.

In testunony whereof I ax my signature.

OTTO WIRZ. In the presence of- ERIK W. MAGNUSON, AUGUST DIETERICH. 

